Soft-shell crab is a prized dish in many ocean-side resorts. Why are the crabs' shells soft?
|A.) The crab has just molted and the new exoskeleton has not yet hardened.|
|B.) These species of crabs live under rocks and therefore have lost the hard exoskeleton over evolutionary time.|
|C.) These species have evolved a light and soft exoskeleton so that gases can diffuse directly between body of the crab and the surrounding water.|
|D.) These species have evolved a light and soft exoskeleton so that they can float in the water column.|
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